EUI Calculator – Energy Use Intensity
Calculate and measure a building's energy efficiency and performance
Calculate Energy Use Intensity (EUI)
Compare your building against typical energy use ranges
Total energy used by the building in one year
Total conditioned floor area of the building
Example Calculations
California Office Building
Location: California, USA
Total annual energy consumption: 200,000 kBtu
Total floor area: 10,000 ft²
EUI calculation: 200,000 kBtu ÷ 10,000 ft² = 20 kBtu/ft²/year
Rating: Excellent efficiency for an office building
Small Apartment Building
Total annual energy consumption: 100,000 kBtu
Total floor area: 5,000 ft²
EUI calculation: 100,000 kBtu ÷ 5,000 ft² = 20 kBtu/ft²/year
Rating: Good efficiency for residential building
EUI Benchmarks (kBtu/ft²/year)
Energy Efficiency Tips
Upgrade to LED lighting systems
Optimize HVAC system performance
Improve building insulation
Install energy-efficient appliances
Implement energy monitoring systems
Consider renewable energy sources
Understanding Energy Use Intensity (EUI)
What is EUI?
Energy Use Intensity (EUI) is a metric that measures the energy efficiency of a building. It is calculated by dividing the total annual energy consumption of a building by its total floor area. EUI provides a standardized way to compare the energy efficiency of buildings of different sizes and types.
Why is EUI Important?
- •Provides standardized energy efficiency comparison
- •Identifies opportunities for energy savings
- •Helps prioritize energy efficiency improvements
- •Tracks building energy performance over time
How to Calculate EUI
- 1Calculate total annual energy consumption of the building in kBtu, kWh, or other energy units.
- 2Determine total floor area of the building in square feet or square meters.
- 3Apply the EUI formula: EUI = Total Annual Energy Consumption ÷ Total Floor Area
💡 Pro Tip: A lower EUI indicates a more energy-efficient building, while a higher EUI indicates less efficiency. Use EUI to benchmark against similar buildings.
Common EUI Units
- •kBtu/ft²/year: Most common in the US
- •kWh/m²/year: Common internationally
- •MJ/m²/year: Used in some regions
Frequently Asked Questions
What are typical EUI values?
EUI values vary by building type and region. Generally, values range from 10 kBtu/ft²/year for very efficient buildings to over 100 kBtu/ft²/year for poorly performing buildings. Data centers typically have the highest EUI values (200-1000 kBtu/ft²/year).
How is EUI measured?
EUI is measured in three steps: (1) Calculate total annual energy consumption, (2) Determine total floor area, and (3) Apply the formula: EUI = Energy ÷ Area.
What is the EUI for a 500 ft² flat consuming 100,000 kBtu per year?
The EUI would be 200 kBtu/ft²/year (100,000 kBtu ÷ 500 ft² = 200). This indicates very poor energy efficiency and significant improvements are needed.
How can I improve my building's EUI?
Improve EUI by upgrading to energy-efficient equipment, optimizing HVAC systems, improving insulation, installing LED lighting, and implementing energy management systems.